Lincoln 1131-08H-A thermal protection and will cease to operate if, Conveyor will not run, needed

		thermal protection and will cease to operate if
		overheating occurs. As the motor overheats and
		then cools, this will cause the oven to cycle on and
		off intermittently. Improper ventilation or lack of
		preventive maintenance may cause this. Also,
		most of the problems listed under “Oven will not
		heat” can cause intermittent failure.
Conveyor will not run	Power supply	Check circuit breakers, reset if required. Check
		power plug to be sure it is firmly in receptacle.
		Measure incoming power, call power co. if
		needed.
	Fuse, 10 Amp	Check, replace if necessary.
	Fuse holder	Check, replace if necessary.
	Hi-limit thermostat, oven cavity	Terminals are normally closed. If open, reset
		thermostat and retest. If thermostat will not hold
		for maximum oven temperature, and oven is not
		exceeding temperature setting, check for proper
		location of capillary bulb in its spring holder. If the
		capillary checks okay, replace the hi-limit
		thermostat.
	Power switch	Check continuity between switch terminals.
		Replace switch as needed.
	Control transformer	Check for supply voltage to the primary of the
		control transformer. If no voltage is present, trace
		wiring back to the oven power relay. If voltage is
		present, check for 24 VAC at the transformer
		secondary. If there is primary voltage but no
		secondary voltage, replace control transformer.
	Conveyor motor	Check for supply voltage to the conveyor motor. If
		no voltage is present, trace wiring back to the
		primary of the control transformer. If voltage is
		present and the motor will not run, check the
		motor windings for opens or shorts.
		WITH POWER OFF: Check the motor windings as
		follows:	- 240Ω approx.
		Grey to black
		Grey to tan -	240Ω approx.
		Tan to black -	480Ω approx.
		If any of the above fails, replace conveyor motor.
	Capacitor, conveyor motor	Check for shorts or grounds. Replace capacitor as
		needed.
		WARNING: Capacitor has a stored charge,
		discharge before testing.
	Switch, conveyor reversing	Check continuity between switch terminals.
		Replace switch as needed.
	Oven control	If there is supply voltage to the motor, and the
		motor, capacitor, and reversing switch check
		good, replace the oven control.
Conveyor motor runs, but	NOTE: Display will indicate
there is no speed display	“Belt Jam”
	Oven control	Check for output voltage from oven control to hall
		effect sensor (sensor is located in conveyor
		motor). Measure voltage at the motor connector,
		red wire and yellow wire. Voltage should be
		approx. 10VDC. If no voltage is present, trace
		wiring back to oven control. If there is no voltage
		present at the oven control, replace the oven
		control.

Impinger II – Advantage Digital Express Service Manual - Domestic 19